Improvement in methods of finishing chilled rolls



1, GEORGE GRANVILLE LOBDELL8L JARRETT MEGAW.

improvement in Method of Finishing Chilled-R0113.

No. 121,180. Patented Nov- 21,1871.

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GEORGE GRANVILLE LOBDELL AND JARRETT MEGAVV, OF WILMINGTON, DEL.

Specification forming part of Letters Patent No. 121,180, dated November 21, 1871.

To all whom it may concern:

Be it known that we, GEORGE GRANVILLE LOBDELL and JARRETT MEGAW, of Wilmington,in the county of New Castle and State of Delaware, have invented a new and useful Improveement in Finishing Chilled Rolls and we do hereby declare that the following is a full, clear, and exact description of the same, reference being bad to the accompanying drawing making a part of this specification.

My invention consists of an improved mode or process of finishing chilled rolls, with the view of producing a perfectly true roll with much less consumption of time and labor than the ordinary mode of finishing chilled rolls demands, our said process being too fully explained hereafter to need preliminary description.

In the accompanying drawing, Figures 1, 2, and 3 are diagrams illustrating the successive branches of our process.

In finishing chilled rolls it has heretofore been the practice to first turn the opposite journals, then to adjust these journals to suitable bearin gs, and, while the roll is revolving on the same, to first turn the body of the roll and then finish its surface by grinding.

The operation of turning the body of the roll is a very tedious one, and the turning-tool required for the purpose is of such a character that the roll is necessarily subjected to great strains. Owing to this the roll is generally far from true, and rarely concentric with its jour-. nals after it has been turned in the usual manner, and must be subjected to a very tedious grinding process before it is in a condition fit for use.

Discarding the usual process of first turning the journals of the roll and then both turning and grinding the body while these journals revolve in bearings, we first turn the body of the roll then, while the turned body is revolving in bearings, we turn the journals; and finally, while the latter are revolving in bearings, we grind the body of the roll.

In Fig. l, A represents a crude chilled roll as it appears after it has been withdrawn from the mold and cleaned. The end a of this roll is adapted to the chuck of a lathe, and the opposite end is provided with a temporary collar, 1), for revolving in the fixed bearing d. The body of the roll from w m is then turned in the usual manner; and this completes the first branch of our process, in relation to which it may be remarked that the roll in its crude state and with its strong ends will withstand the very severe strains to which it is subjected by turning the body much better than a roll which is weakened by the turning of'the journals.

The diagram, Fig. 2, illustrates the second branch of our process, which consists in causing the turned body of the roll to revolve in fixed bearings e e while the opposite journals f f and other portions of the ends of the roll are turned. These journals must necessarily be concentric with the body of the roll, and hence the third and final branch of the processthat of finishing the body of the roll by grinding-is rendered more easy of accomplishment than when the body of the roll has been turned while revolving in its finished and weakened journals, for in-the latter case the springing of the body and the weakness of the journals tend to throw the rolls out of true and they must be subjected to a long grinding process before they can be properly trued, whereas the concentricity of the journals with the body of the roll is determined by the turning of the said journals while the body of the roii revolves in bearings; and it is this insured concentricity of the journals with the body of the roll which renders the process of grinding an easy matter, as the grinder has nothing more to do than to smooth the surface of the body of the roll by removing the marks made by the turningtool.

It has not been deemed necessary to illustrate or describe the mechanism for turning and grinding, as these operations are well known to those familiar with the manufacture of chilled rolls.

We claim as our invention- I The within -descrihed process of finishing a chilled roll-that is to say, first turning the body of the roll, then turning the journals while the turned body revolves in bearings, and, finally, grinding the body of the roll while its journals revolve in bearings.

In testimonywhereof we have signed our names to this specification in the presence of two subscribing witnesses.

GEOR-GE GRANVILLE LOBDELL. JARRETT MEGAW. 

